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Conference 7.286::fddi

Title:FDDI - The Next Generation
Moderator:NETCAD::STEFANI
Created:Thu Apr 27 1989
Last Modified:Thu Jun 05 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:2259
Total number of notes:8590

345.0. "minimal FDDI configuration" by ATZIS4::HAINZL_R () Mon Sep 16 1991 05:35

what is the mimimal configuration to connect

1 FDDIcontroller 400 and
1 DECbridge 6xx (3 Ethernets)
to a DECconcentrator.

suggestion: 
	FDDIconcentrator with management-modul DEFCN-MA (providing Port A and B)
	connecting FDDIcontroller 400 to port A
	connecting DECbridge 610 (SAS-Version) to Port B.

question: 1) does it work
	  2) if yes, is this configuration supported ?


thanks in advance and regards
Richard
T.RTitleUserPersonal
Name		DateLines
345.1One opinionSYORPD::DEEPBob Deep @SYO, DTN 256-5708Mon Sep 16 1991 09:2622
re:                     <<< Note 345.0 by ATZIS4::HAINZL_R >>>

>1 FDDIcontroller 400 and
>1 DECbridge 6xx (3 Ethernets)
>to a DECconcentrator.

Richard,

   A couple of things.   First, I think the FDDIcontroller 400 is a SAS device,
and therefore requires connection to a DECconcentrator M port (not A or B).   
The DECbridge can be DAS or SAS, as you have indicated.

The simplest configuration would be an "FDDI in a box" solution, consisting 
of a DECconcentrator 500, with a DEFCN-MA management board, and a DEFCN-NA 
(4 port SAS board).

I don't know if its possible to run without the management board, and I 
wouldn't recommend it anyway.

Hope this helps...

Bob
345.2FDDI in a box is bestJUMP4::JOYHappy at lastMon Sep 16 1991 10:569
    Re:.-1 It IS possible to run without the management board and if the
    DEFCN was being utilized in a test or pilot environment, it might not
    be necessary to have remote management of the concentrator. You could
    still manage the bridge using DECelms or DECmcc ELM. The config in the
    basenote is not supported and is also more expensive than a DEFCN with one
    M-port board.
    
    Debbie
345.3KONING::KONINGBrivu Latviju!Mon Sep 16 1991 15:3817
The configuration in the base note is definitely NOT a good idea, but it
IS permitted.  (S ports can connect to anything, even A and B.)  The reason
it's a bad idea is that A and B ports are meant to form a dual ring, so
A should connect to B.  If you connect A or B to S, that creates a wrapped
ring, just as if you had a dual ring with one failure.  In a wrapped ring,
any additional failure will partition the network.

There's an even cheaper configuration which is often forgotten: you can connect
an S port directly to another S.  This results in a two-node FDDI.  Any
extension of this configuration requires a concentrator, of course.  But if
you have a special bounded requirement of exactly two nodes, or you want 
to connect two nodes quickly for test purposes, just connect them directly.

So your minimum configuration is just a DEFZA and a DECbridge-610, with the
cable to connect them...

	paul
345.4supported, but not recommendedBAGELS::LEVYMon Sep 16 1991 17:221
    Make that a DEMFA and a DECbridge 610 (DEFEB-TA/TB).....
345.5VNABRW::HAINZL_RThu Sep 19 1991 06:183
Thanks a lot for your help

regards Richard